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(No Model.)

I. B. MOTT. COMPOSITION FOR STEAM PIPE AND BOILER GOVERINGS. No.462,057. Patent-ed Oct. 27, 1891.

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UNITED STATES PATENT OFFICE.

FRANK B. MOTT, OF PROVIDENCE, RI-IODE ISLAND.

COMPOSITION FOR STEAM PIPE AND BOILER COVERINGS.

SPECIFICATION forming part of Letters Patent No. 462,057, dated October27, 1891.

Application filed May 11, 1891. Serial No. 392,356. (No specimens.)

T0 aZZ whom it may concern.-

Be it known that I, FRANK B. MOTT, a citizen of the United States, and aresident of Providence, in the county of Providence and State of RhodeIsland, have invented certain new and useful Improvements inCoinpdsitions for Steam Pipe and Boiler Coverings; and I do herebydeclare that the following is a full, clear, and exact description ofthe invention, whichwill enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, which form a part of this specification, and inwhich- Figure 1 is a perspectiveview of a section of steam-pipe providedwith inyimproved covering, showing the manner of putting on the twolayers of coverings; and Fig. 2 is a transverse sectional view of thepipe and its two layers of covering.

Like letters of reference denote corresponding parts in both thefigures.

The invention relates to plastic compositions for coveringsteam-boilers, steam-pipes, and other hot surfaces to prevent loss ofheat by radiation and also to protect the covered surfaces; and itconsists in the peculiar com bination of ingredients, which will beherein after more fully described and claimed.

To prepare and apply this composition, I use the following ingredients,to wit: wool waste, asbestus, marl, graphite, and rice, mixed with waterand boiled; but mixed in slightly-different proportions, according towhether it is to be used for the inner or outer layer or application,two separate coatings of the com position being used as a rule, in orderto produce the best results. For the inside layer or first coat, whichis applied direct to the pipe or boiler, these several ingredients aremixed in the following'proportions by weight: wool waste, fifty parts;asbestus, twenty parts; marl, fifteen parts; graphite, fourteen parts;powdered rice, one part. Theseseveralingredients are finely comrninuted, mixed with a suitable quantity of water, and boiled for about halfan hour. It is then taken off the fire and set aside to cool, and whencool enough to handle it is applied to the pipe,

boiler, or other article to be covered with a trowel or other suitableimplement in an even layer about one inch thick, which, while still in aplastic state, is wound spirally with a band of muslin B or othersuitable textile fabric. After this first layer or coating (shown at A)has become dry and hard the second or outside coat 0 is put on over themuslin coverin g, and to prepare this I vary the proportions of theingredients somewhat, as follows: wool waste, forty parts; asbestus,thirty-parts marl,

heat, will effectually prevent loss of heat by radiation, and, unlikemany compositions intended 'fo r the same purpose, it does not crack orpeel off. It will be found to adhere closely to the pipe and resist theaction of heat better than any other covering with which I amacquainted, as it does not char or burn, but retains its solidity andanti-radiating qualities under all conditions, even when subjected tothe action of excessive heat.

Having thus described my invention, I

claim and desire to secure by Letters Patent ,of the United States Theherein-described composition for coatin g heat-radiatin g surfaces,consisting of wool waste, asbestus, marl, graphite, and powdered rice,in the proportions substantially as specifled.

In testimony that I claim the foregoing as my own I have hereuntoalfixed my signature in presence of two witnesses.

FRANK B. .MOTT.

Witnesses:

JOH ANDERSON, ELIAS H. LEDERER.

